1 /* crypto/evp/bio_md.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <errno.h>
61 #include "cryptlib.h"
62 #include <openssl/buffer.h>
63 #include <openssl/evp.h>
64
65 /* BIO_put and BIO_get both add to the digest,
66 * BIO_gets returns the digest */
67
68 static int md_write(BIO *h, char const *buf, int num);
69 static int md_read(BIO *h, char *buf, int size);
70 /*static int md_puts(BIO *h, const char *str); */
71 static int md_gets(BIO *h, char *str, int size);
72 static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
73 static int md_new(BIO *h);
74 static int md_free(BIO *data);
75 static long md_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
76
77 static BIO_METHOD methods_md=
78 {
79 BIO_TYPE_MD,"message digest",
80 md_write,
81 md_read,
82 NULL, /* md_puts, */
83 md_gets,
84 md_ctrl,
85 md_new,
86 md_free,
87 md_callback_ctrl,
88 };
89
90 BIO_METHOD *BIO_f_md(void)
91 {
92 return(&methods_md);
93 }
94
95 static int md_new(BIO *bi)
96 {
97 EVP_MD_CTX *ctx;
98
99 ctx=EVP_MD_CTX_create();
100 if (ctx == NULL) return(0);
101
102 bi->init=0;
103 bi->ptr=(char *)ctx;
104 bi->flags=0;
105 return(1);
106 }
107
108 static int md_free(BIO *a)
109 {
110 if (a == NULL) return(0);
111 EVP_MD_CTX_destroy(a->ptr);
112 a->ptr=NULL;
113 a->init=0;
114 a->flags=0;
115 return(1);
116 }
117
118 static int md_read(BIO *b, char *out, int outl)
119 {
120 int ret=0;
121 EVP_MD_CTX *ctx;
122
123 if (out == NULL) return(0);
124 ctx=b->ptr;
125
126 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
127
128 ret=BIO_read(b->next_bio,out,outl);
129 if (b->init)
130 {
131 if (ret > 0)
132 {
133 if (EVP_DigestUpdate(ctx,(unsigned char *)out,
134 (unsigned int)ret)<=0) return (-1);
135 }
136 }
137 BIO_clear_retry_flags(b);
138 BIO_copy_next_retry(b);
139 return(ret);
140 }
141
142 static int md_write(BIO *b, const char *in, int inl)
143 {
144 int ret=0;
145 EVP_MD_CTX *ctx;
146
147 if ((in == NULL) || (inl <= 0)) return(0);
148 ctx=b->ptr;
149
150 if ((ctx != NULL) && (b->next_bio != NULL))
151 ret=BIO_write(b->next_bio,in,inl);
152 if (b->init)
153 {
154 if (ret > 0)
155 {
156 if (!EVP_DigestUpdate(ctx,(const unsigned char *)in,
157 (unsigned int)ret))
158 {
159 BIO_clear_retry_flags(b);
160 return 0;
161 }
162 }
163 }
164 if(b->next_bio != NULL)
165 {
166 BIO_clear_retry_flags(b);
167 BIO_copy_next_retry(b);
168 }
169 return(ret);
170 }
171
172 static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
173 {
174 EVP_MD_CTX *ctx,*dctx,**pctx;
175 const EVP_MD **ppmd;
176 EVP_MD *md;
177 long ret=1;
178 BIO *dbio;
179
180 ctx=b->ptr;
181
182 switch (cmd)
183 {
184 case BIO_CTRL_RESET:
185 if (b->init)
186 ret = EVP_DigestInit_ex(ctx,ctx->digest, NULL);
187 else
188 ret=0;
189 if (ret > 0)
190 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
191 break;
192 case BIO_C_GET_MD:
193 if (b->init)
194 {
195 ppmd=ptr;
196 *ppmd=ctx->digest;
197 }
198 else
199 ret=0;
200 break;
201 case BIO_C_GET_MD_CTX:
202 pctx=ptr;
203 *pctx=ctx;
204 b->init = 1;
205 break;
206 case BIO_C_SET_MD_CTX:
207 if (b->init)
208 b->ptr=ptr;
209 else
210 ret=0;
211 break;
212 case BIO_C_DO_STATE_MACHINE:
213 BIO_clear_retry_flags(b);
214 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
215 BIO_copy_next_retry(b);
216 break;
217
218 case BIO_C_SET_MD:
219 md=ptr;
220 ret = EVP_DigestInit_ex(ctx,md, NULL);
221 if (ret > 0)
222 b->init=1;
223 break;
224 case BIO_CTRL_DUP:
225 dbio=ptr;
226 dctx=dbio->ptr;
227 if (!EVP_MD_CTX_copy_ex(dctx,ctx))
228 return 0;
229 b->init=1;
230 break;
231 default:
232 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
233 break;
234 }
235 return(ret);
236 }
237
238 static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
239 {
240 long ret=1;
241
242 if (b->next_bio == NULL) return(0);
243 switch (cmd)
244 {
245 default:
246 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
247 break;
248 }
249 return(ret);
250 }
251
252 static int md_gets(BIO *bp, char *buf, int size)
253 {
254 EVP_MD_CTX *ctx;
255 unsigned int ret;
256
257
258 ctx=bp->ptr;
259 if (size < ctx->digest->md_size)
260 return(0);
261 if (EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret)<=0)
262 return -1;
263
264 return((int)ret);
265 }
266
267 /*
268 static int md_puts(bp,str)
269 BIO *bp;
270 char *str;
271 {
272 return(-1);
273 }
274 */